Ring baffle pressure distribution and slosh damping in large cylindrical tanks

An investigation was conducted to determine the pressure loads and damping associated with rigid ring baffles in relatively large cylindrical tanks. The radial and circumferential pressure distribution, as well as the damping, was measured on a ring baffle subjected to fundamental antisymmetric slosh in a 284-cm-diameter rigid tank. Experimental and analytical data are presented as a function of slosh velocity or amplitude, baffle spacing, and baffle locations both above and below the liquid surface. Results suggest that pressure distributions and damping values can be determined from available theories for the design of single and multiple baffle configurations

Investigation of slosh anomaly in Apollo lunar module propellant gage

Analysis of propellant sloshing in lunar module during Apollo 14 flight and resultant erroneous indication of low level of propellan

Delay-induced multistability near a global bifurcation

We study the effect of a time-delayed feedback within a generic model for a saddle-node bifurcation on a limit cycle. Without delay the only attractor below this global bifurcation is a stable node. Delay renders the phase space infinite-dimensional and creates multistability of periodic orbits and the fixed point. Homoclinic bifurcations, period-doubling and saddle-node bifurcations of limit cycles are found in accordance with Shilnikov's theorems.Comment: Int. J. Bif. Chaos (2007), in prin

Recognizing Campus Landscapes as Learning Spaces

Today’s university learning environments must encompass more than technology upgrades and classroom additions - the entire campus must be perceived as a holistic learning space that provides a holistic learning experience. The potential of campus nature in replenishing student cognitive functioning is underutilized. Recognizing campuses as vital learning landscapes harnesses their potential as attentional resources. A whole-systems approach to campus design requires communication and collaboration among academic, administrative and facilities planning stakeholders. This approach goes beyond the aesthetic value of campus open spaces for student recruitment to advertising its educational value that emphasizes something deeper than what meets the eye

System for measuring passenger reaction to transportation-vehicle vibration

Equipment is capable of measuring frequencies from 0 to 50 Hz and is portable, light, inexpensive, and easily adaptable to field operations. System could be used in situations where it is necessary to record simultaneously subject response to other types of physical measurement or stimuli, such as temperature, noise, or pressure

Recognizing Campus Landscapes as Learning Spaces

American higher education institutions face unique twenty-first century changes and challenges in providing good, holistic learning spaces for the diverse and evolving needs of today’s college student. Continued enrollment growth, societal and technological changes, financial challenges, and a need for increased universal and open access create ever more diverse, changing and complex US university systems. In 2009, 20.4 million students were enrolled in 2- or 4-year colleges and universities. By 2019, enrollments are expected to rise 9% for students under age 25, and rise 23% for students over the age of 25 (Snyder & Dillow, 2011). Questions of where, when, how, and with whom today’s college students learn, confront the traditional notions of how university spaces are designed and used for effectiveness (Hashimshony & Haina, 2006). Therefore, we propose that the natural landscape of a university campus is an attentional learning resource for its students

Oscillatory activity in the infant brain reflects object maintenance

The apparent failure of infants to understand "object permanence" by reaching for hidden objects is perhaps the most striking and debated phenomenon in cognitive development. Of particular interest is the extent to which infants perceive and remember objects in a similar way to that of adults. Here we report two findings that clarify infant object processing. The first is that 6-mo-old infants are sensitive to visual cues to occlusion, particularly gradual deletion. The second finding is that oscillatory electroencephalogram activity recorded over right temporal channels is involved in object maintenance. This effect occurs only after disappearance in a manner consistent with occlusion and the object's continued existence